I use "_eof_" (EOF is short for "End Of File") because it is traditional, but you can use anything, as long as it does not conflict with a bash reserved word.
我使用“ _ E OF _ ” (EOF表示文件的末尾)，是因为，这是一个传统的表示形式，但是，你可以使用任何字符穿，只要你所用的字符串不跟bash的保留字相冲突就可以了。
When all the data have been written, set the eof (end-of-file) argument.
当所有数据全部写入之后，就需要设置eof(文件结束参数)。
It returns NULL, defined in stdio.h, for either error or EOF [end-of-file]; after the loop, we check for which one occurred.
对于错误或EOF[文件结束]，它都返回NULL，这是在stdio . h中定义的；循环结束后，我们会检查究竟是哪种情况。
We are not able to push back EOF. But when we've reached the end of the file, we can push back a character.
我们不能推回一个EOF，但是当我们到达文件的结尾时，我们可以推回一个字符。
CE_RXOVER An input buffer overflow has occurred. There is either no room in the input buffer, or a character was received after the end-of-file (EOF) character.
接收缓冲区发生溢出错误。接收缓冲区没有足够的空间，或者有字符出现在了EOF字符后。
CE_RXOVER An input buffer overflow has occurred. There is either no room in the input buffer, or a character was received after the end-of-file (EOF) character.
接收缓冲区发生溢出错误。接收缓冲区没有足够的空间，或者有字符出现在了EOF字符后。
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